A severe snowstorm with high winds and low visibility
A rare and little known kind of lightning having the form of a moving globe of light that persists for periods of up to a minute.
above ground level
The proportion of the incident light or radiation reflected by a surface, typically that of a planet or moon.
A condition when no air motion is detected
instrument for measuring altitude
upper limit of clouds
Cloud forming a continuous uniform layer that resembles stratus but occurs at medium altitude, usually 6,500–23,000 feet
For a given cloud or cloud layer, that lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles
The quantity of rotation of a body, which is the product of its moment of inertia and its angular velocity.
A funnel cloud is a funnel-shaped cloud of condensed water droplets, associated with a rotating column of wind and extending from the base of a cloud (usually a cumulonimbus or towering cumulus cloud) but not reaching the ground or a water surface
a tall, distinctively anvil-shaped thundercloud
An act or process of merging
Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low pressure area)
A location where airflows or ocean currents meet, characteristically marked by upwelling (of air) or downwelling (of water)
A region of lower atmospheric pressure, esp. a cyclonic weather system
A system of winds rotating inward to an area of low atmospheric pressure, with a counterclockwise (northern hemisphere) or clockwise (southern hemisphere) circulation; a depression
A strong downward current of air from a cumulonimbus cloud, usually associated with intense rain or a thunderstorm
how far a person can see
A mass of whirling fluid or air, esp. a whirlpool or whirlwind
a roughly circular, rotating cloud that protrudes from the base of a thunderstorm cloud; it is often the beginning of a tornado.